Learn your most important information first

Do you remember your first day of school?
Do you remember what you were wearing and who you talked to on that day?
Do you remember the first time you drove a car?
Do you remember your seventh day of school? Or your tenth?
Probably not as these aren't as memorable as the first. Generally, anything that happens first in your life will be more memorable than subsequent times.
When you sit down to study, go over your most important information first, it will be more memorable for you. Revising your notes from yesterday is a great first at the beginning of your study time.